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The non-equilibrium dynamics of a one-dimensional(1 D)topological system with 3 rd-nearest-neighbor hopping has been investigated by analytical and numerical methods.An analytical form of topological defect density under the periodic boundary conditions(PBC)is obtained by using the Landau-Zener formula(LZF),which is consistent with the scaling of defect production provided by the Kibble-Zurek mechanism(KZM).Under the open boundary conditions(OBC),quench dynamics becomes more complicated due to edge states.The behaviors of the system quenching across different phases show that defect production no longer satisfies the KZM paradigm since complicated couplings exist under OBC.Some new dynamical features are revealed. 相似文献
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Many classical encoding algorithms of vector quantization (VQ) of image compression
that can obtain global optimal solution have computational complexity O(N). A pure
quantum VQ encoding algorithm with probability of success near 100% has been
proposed, that performs operations 45\sqrt{N} times approximately. In this paper,
a hybrid quantum VQ encoding algorithm between the classical method and the
quantum algorithm is presented. The number of its operations is less than \sqrt{N}
for most images, and it is more efficient than the pure quantum algorithm. 相似文献
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This paper proves that a set of orthogonal pure states are
indistinguishable by restricted local projective measurement and
classical communication if the sum of their Schmidt ranks is larger
than the dimension of their joint Hilbert space. This result is
useful in determining the local distinguishability of quantum states
and is stronger in some respects than that of Hayashi et al
[Phys. Rev. Lett. 96, 040501]. In addition, it presents a new
method to determine the local distinguishability of orthogonal
states by projecting measurement operators into their subspaces. 相似文献
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Preparation of the W State of Atoms in a Single Cavity or N Distant Cavities by Photon Interference 下载免费PDF全文
We suggest two schemes to generate the W state of N A-type three-level atoms. In the schemes, identical N three-level atoms are trapped in a cavity or N distant cavities. The success or failure of the generation of the W state can be determined by detecting the polarization of photon leaking out of the cavity. The result demonstrates that the W state is free from both the cavity loss and the spontaneous emission due to the fact that the two ground states (left and right) of the three-level atoms are stable states (or metastable states). 相似文献
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Emission Spectrum from Two Atoms in Bell States in a Cavity 总被引:5,自引:0,他引:5
1 Introduction Inrecentyears ,therehasbeenmuchinterestinentangledstatesbecauseofthedevelopmentof quantuminformation .Entanglementisoneofthemoststrikingfeaturesofquantummechanics .Anentangledstate ,as generallydefined ,cannotbeseparatedintoaproductofthesta… 相似文献